Go to the Pages app shortcut bar above the keyboard, then tap Link.
In Link Settings, tap Link To, then tap Bookmark.
In the next row, tap Bookmark, then tap a destination.
If the destination you want isn’t in the list of suggested bookmarks, do one of the following:
Tap Manage Suggestions at the bottom of the menu.
Tap Set Up Suggestions at the bottom of the menu.
If you don’t use paragraph styles, you may not see suggestions.
Tap the paragraph style that the desired bookmark uses.
Tap Back at the top of Edit Suggestions to return to the bookmark list.
Tap Bookmark, then tap the destination you want to link to.
To verify the bookmark location, tap Back, then tap Go To Bookmark, or tap the document to close the settings.
You can rename or delete a bookmark without affecting the bookmarked text in the document.
Go to the Pages app Use text styles in Pages on iPad