You can add a location to your photo or video before posting. If you added a home mountain to your profile, it will be added as your default location to any post. You can edit this by tapping on the name of your home mountain. If you haven't added a home mountain, tap on Select Mountain.
Find your location in the list of mountains suggested or search for it by name and select it. If your mountain doesn't come up in search, you can add it. Type in the full name of the location and tap Save as "[name of mountain]"
Learn how to add or edit the location of an existing post.