The Sims Wiki:Wikia confirmation

Because Miraheze uses a separate account system from Wikia, all Wikia contributors will need to create a new account for The Sims Wiki on Miraheze. To help prevent against impersonation, we ask that all editors from Wikia who wish to register for Miraheze confirm the link between their two accounts. There are multiple ways you can do this.

Option 1. Over Discord
If you have already confirmed your Wikia identity over Discord, simply message a server operator or moderator and tell them the name of your Miraheze account. They will ask you to edit The Sims Wiki:Discord confirmation in a similar fashion to confirm you own it.