Use the Set Any Bookmark command in the Mark menu to set a bookmark at the current position of the cursor. The number on the bookmark will be the lowest-numbered bookmark that isn't used yet in the active file. When Mark|Project-Wide Bookmarks is active, the number will be the lowest-numbered bookmark that isn't used yet in the active project.
If all 10 numbered bookmarks have been set, the Set Any Bookmark command sets a numberless bookmark. You can place as many numberless bookmarks as you like. Numberless bookmarks cannot be jumped to directly with the Go to Bookmark X commands. You can jump to them with the Go to Next Bookmark and Go to Previous Bookmark commands.
Unlike the Set Bookmark X commands, the Set Any Bookmark command never removes a bookmark from another location. It always sets a new bookmark if the line the cursor is on doesn't have a bookmark yet. If the line the cursor is on does have a bookmark, that bookmark is removed and no new bookmark is set. Using Set Any Bookmark again on a line that already has a numberless bookmark is the only way to remove individual numberless bookmarks.
Though bookmarks are shown in the left margin, they are placed at character positions. Bookmarks stay with the character they were placed at when you edit the file. If you delete the character, the bookmark shifts to the nearest remaining character.
Bookmarks are not saved into a file when you use File|Save. EditPad Pro does automatically remember the bookmarks you set for all files that are listed in the reopen menu, and all files you added to your favorites. Projects also store the bookmarks for all the files in the project. When opening files by opening a project, the files' bookmarks are restored from the project file. When opening a file without opening a project, its bookmarks are retrieved from the reopen menu or the favorites if the file is listed there, even if you didn't use the reopen menu or the favorites menu to open the file.
Mark|Set Bookmark 1, 2, 3...