Hi Bonita:
When I first started I had the same problems. There was no eraser big enough to fix what I'd done so I deleted my whole tree and started over.
The Rhode Island Stephen Hopkins (1707-1785) was the one who signed the Dec. of Inpend. He is here:
http://www.gaspee.org/StephenHopkins.htm
http://en.wikipedia.org/wiki/Stephen_Hopkins_(politician)
He is not related to Stephen of the Mayflower (1581-1644).
Easiest place for all the basics on Mayflower
http://tinyurl.com/Johnson-Book
(published 2007 with parts now at FREE GoogleBooks)
http://tinyurl.com/WIKIPEDIA-Stephen-Hopkins
Apparently the trees you found confused them. Don't believe any tree on Geni.com, MyHeritage, Ancestry, FamilySearch or any website for these generations of ancestors. Almost every tree has something wrong with it within 3 generations of almost everyone back then unless there are records attached. Especially if they are famous. You can always write to the owner of the tree and ask if they could help you with the sources they used. If they don't bother to write back you'll have your answer. "They ain't got nuthin'" and they know it. They just copied off the kid in the next seat and we know how that turns out.
A warning about Ancestry databases that often appear with as multiple Green Leaf Hints.
The entire Family Data Collections Series (Individual, Births, Marriages, Deaths);
AGBI,
OneWorldTree;
the Millennium File;
Mayflower Births & Deaths, Vol 1/2;
U.S., New England Marriages Prior to 1700;
U.S. and International Marriage Records 1560-1900;
Passenger and Immigration Lists Index 1500s - 1900s;
are databases or index lists or transcribed indexes of transcribed index lists, not historical records or documents.
Much of it was "extracted" (grabbed) by programmed computer sweeps through submittals from people who often collected names. We have to actually -click on them and -read the image/source/description/comments to make sure they even make sense or to see where they came from (their source). Sometimes just by looking at the wording we can discount the authenticity. They're right if the information gathered is right, but a lot of "facts" for these families have been invented over the years and generations have been mingled and mangled.
Ancestry doesn't check images, stories, Green Leaf Hints, Find-a-Grave submittals, other trees or comments for accuracy.
I can't remember if I found you on the "Thomas Nicholas Arnold" page except that's not the name of the father Joana Arnold who married the William Hopkins of Somerset (who has no parents or birth date) who is the guy I assume you're going after.
Commoners in England didn't have middle names back then. None of the Pilgrims did. Only 3 of the men who signed the Declaration of Independence did
Joana's father was just plain Nicholas. See the part in here about the false pedigree with Thomas. Probably easiest to search for Thomas so he pops out.
https://en.wikipedia.org/wiki/William_Arnold_(settler)
When someone shows up on a tree with a middle name back in that era don't assume that either one of them is correct. LOTS of instances where both turn out to be wrong.
For your Rhode Island guys you want Hopkins people from Somerset. But there are NONE that have proven connection to William. He comes out of nowhere. Don't go looking for Williams to put in your tree. Experts have already tried and you'll just get frustrated. The guys in Gloucestershire and Hampshire aren't related to the Somerset folks or even to each other. There's no proof that the man from Hartford, CT is from Gloucestershire. You can imagine how many John Hopkins and wives named Elizabeth there were back then. If they have a common first name and no documents submitted so far, then there's little to no chance that we can prove them.
Time for ice cream. Brain fried.