When did you have the DNA done at MyHeritage?
If it was since the end of March 2019, I think you can transfer them to FamilyTreeDNA (FTDNA) and then connect your Geni profile to your Kit at FDNA
Otherwise you need to take the FamilyFinder test at FDNA, then connect.
FamilyFinder is on sale thru Dec 26 for only $49 with no shipping cost.
If you transfer, it is free to transfer and see matches, but it will cost $19 (one time only) if you want to see Ethnicity Results and use the Chromosome Browser [these are included in the cost of the test if test there]
(transfer is possibly a misnomer - nothing leaves MyHeritage - you download raw data from MyHeritage, upload it to FTDNA)