Searching for Users:
Go to the Spiral section of the app.
Utilize the search bar located at the top of the screen.
Enter the username of the user you wish to join.
Once you've entered the username, click on the user's profile from the search results.
This action will open the user's account.

Following Users from Profile:
Within the user's profile, you'll find a red button labeled "Join."
Simply click on this button to start joining the user.

Following Suggested Users:
Additionally, on the Spiral page, you will find suggested users to join.
From this page, you can directly join suggested users by clicking on their profiles.