I am a member of the church and I have been unable to access my familysearch account. Can I reset my password/username using my church membership number?
If you are a member of The Church of Jesus Christ of Latter-day Saints, you may be able to recover your FamilySearch username with your Church record number.
Here is an article for the FamilySearch Help Centre which give details on how to do this:
Members of The Church of Jesus Christ of Latter-day Saints may be able to use their Church record number as a recovery option.
If you need any help, ring your FamilySearch Support in your country with the free call number