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It's a red square with a white triangle inside. You'll usually find it on the home screen. It's at the bottom-right corner of the app. It's near the top of the screen. If you've uploaded many videos, it may be hard to find. Type some keywords into the search bar at the top of the screen to narrow down the list. A menu will expand. It's near the center of the menu. These are the first two blanks at the top of the "Edit details" screen. Tap the current privacy setting under "Privacy" to open the drop-down menu, then tap your selection. Type tags into the "Tags" box near the bottom of the screen. It's at the top-right corner of the screen. These settings will update immediately.
Open YouTube on your iPhone or iPad. Tap Library. Tap My videos. Scroll to the video. Tap next to the video's name. Tap Edit. Edit the title and description. Edit your privacy settings. Edit your tags. Tap SAVE.