You can change your profile's content by simply clicking your profile picture (top-right) » 'Edit profile' » select the section you'd like to edit » make your changes.
Note: On smaller screens the 'profile picture' is replaced with the sidebar menu icon ☰.
You can manage your profile content while in the App by tapping the sidebar menu icon ☰ » tap your profile picture » tap the blue pen of the section you'd like to edit » make your changes » tap again the blue pen to save your changes.
You can manage your content while in the App by tapping the gear-wheel icon » next to your profile picture, tap 'View profile' » tap the 'Edit' button on top right » select the section you'd like to edit. All your changes are saved automatically.