Hi Black_Beard1865 thanks for contacting us and welcome to the forums!
If you would like to relink your Steam to your Uplay account, try logging into your correct Ubisoft account here -
https://account.ubisoft.com/
Then open Steam and launch any Ubisoft game, when it asks you to log in with your Ubisoft username/email and password, it should link your Steam and Uplay IDs together.