As of Jul 28, 2020 there were 338 Family Tree DNA mtDNA testees and 459 Y-DNA testees who have their mitoYDNA ID in WikiTree.*
Here are several short videos showing some of the benefits of having your mtDNA or Y-DNA in mitoYDNA https://www.youtube.com/channel/UCDHVOlEX8n6WCojXShgejoQ/videos
mitoYDNA allows you to view mtDNA differences from the Cambridge Reference Sequence and Y DNA haplotypes via WikiTree. It allows you to make comparisons of up to 24 people (via WikiTree). mitoYDNA is accessible to all WikiTree users so long has you are registered and logged in at mitoYDNA.org. Like WikiTree, mitoYDNA is collaborative and free.
* mitoYDNA’s statistics page https://www.mitoydna.org/Help/statistics shows more users because some of them are not in WikiTree.
First, be sure you have registered at mitoydna.org https://m.youtube.com/watch?v=I0WWnDdWKKw
Second, to upload your mtDNA, use the Chrome browser and install the mitoYDNA Chrome extension. Step by step instructions to add your mtDNA are at