If you want to follow a user because you like the content they post, for example, you can do it like this:
1. Select the 'Search' icon on the right, and write the name of the user that you want to follow.
NOTE: we have been getting some reports of issues with copypasting the usernames, so try to write them from scratch.
2. Find the correct user that you want to follow, and click on the Follow button.
CLICKING ON THE USER'S NAME
1. Point to the username and click on it.
2. Press the 'Follow' button.
Here's a gif demonstrating the process:
have fun following your favorite users!