Your sign-in, your cloud backup, and your Garmin watch pairing all live here.
The top of the page shows your account status — signed in or out, your plan, and a founder badge if you have one. Below that, sign-in controls, then Pair your Garmin watch, and at the bottom, Delete account.

Signing out never deletes anything on this device — your workouts stay right where they are, and signing back in re-syncs. Delete account is different: it permanently removes your cloud data. Workouts already saved on this device stay on this device, but nothing server-side can be recovered afterward, so it asks you to confirm before it happens.
If your watch stops syncing, that's almost always Garmin Connect itself needing re-authorization, not a BulkForged problem — see "My Garmin watch stopped syncing".
Related: "My Garmin watch stopped syncing — is BulkForged broken?", "Pairing your watch to your account".