

You dont. You can bind your DNA results from FTDNA to Geni profiles using the link in the DNA tab of the profile the DNA test is for. The DNA data itself will remain on FTDNA.
If you dont have a FTDNA DNA test you can upload the raw DNA data (from MyHeritage, Ancestry etc) to FTDNA first. https://www.familytreedna.com/autosomal-transfer