If you have multiple accounts (be it artist, label, or fan accounts), and you'd like to link them so that they're all accessible under a single login identity, simply follow these steps:
- If you have a fan account, log into your fan account first. (This is important!)
- If not, pick the artist or label account you use most often and log into that.
- Go to: gear > Settings > Linked Accounts.
- Link all of your other accounts.
Note: If you're a label account, this is not the way to add artists to your roster. Info on that is over here.