Missing edit link?
Sometime ,I want to edit a question, but the "edit" button isn't there, like here.
Why is that?
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There are a couple cases in which you can't suggest an edit. The most common is that the question already has a suggested edit, which is what's happening in this case. Once that edit gets approved/rejected the edit link will come back. It can also happen if the site has too many pending suggestions, but I don't know that that's ever actually happened
This is usually because there is already an edit pending review on the question. See this answer on meta.biology endorsed by Balpha
That normally happens because there is already a pending edit that needs to be first approved; as you don't have the privilege of approving suggested edits, you don't see the link.
Users who can edit any post, and approve suggested edits see something similar to what shown in this screenshot (taken for this answer).