How do I remove Journal entries in Skyrim, or mark them as finished? [duplicate]

No, there is no in-game way to remove started quests from journal(unless you finish them).

Best way is to use quest tracking to organize your journal - e.g. track all wanted quests and keep "duplicates" untracked, it will make a mess of your compass but you can use map as needed.

If you want to add mods to your game you can use this one to remove some quests from the journal.Good thing about this one is that you can still complete quests you removed,you just can't see the marker and journal entry.

Via the console you can use setstage <quest ID> <stage #> Write without the brackets.To find your quest ID and stage # search for your quest on UESP.

If you are using PC you can use the console command setstage followed by the quest ID to "finish" any quest. UESP has the list of quests and inside each you can see its ID. To open the console command use the tilde-key (~), it sits before the "1" key and under the ESC-key.

If posible, just try to finish the quest by yourself :) unless its bugged of course.