If you'd like to sign in as one of your creators, do the following:
1. click / tap My Creators at the top;
Desktop:
Mobile:
2. find the account in the list and click / tap the icon with three dots on the left;
3. click / tap Sign In as This Creator and confirm the action;
4. You will see a purple banner at the top saying that you're signed in as the creator. If you want to get back, just click / tap Back to My Creators.