At the gym:
Select your gym from the list of locations you follow, or search for it.
Tap "View Climbs" from the profile screen to open the climb list.
Swipe left on a climb to log an attempt, or swipe right to log a send.
A counter in the top right corner tracks your total attempts and sends (volume) for the session. Tap it to view your Logbook.
Outdoors:
Use the "Areas" tab to filter down to your destination, or search the destination list.
Use filters to help narrow down what you're looking for.
Swipe left to log an attempt, or swipe right to log a send.
For more detail on a specific climb (adding a rating, comment, or media), go directly to the climb's page instead:
Find the climb and tap into its page.
Tap "Log Attempt" or "Log Send" at the bottom of the page.
Once you've logged a send, you can use the camera and pencil icons from the climb list to add media and details like rating and comments.