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I downloaded a login form but I'd like to change its content without actually changing the plugin files so that it won't cause problems when updating later on. How can this be done?

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what plugin exactly? – Michael Oct 11 '11 at 16:01
It's Sidebar Login – Bob Oct 11 '11 at 16:09
How about a link? – kaiser Oct 11 '11 at 16:17

There are no filters for the plugin's output and this plugin wasn't built as a class (where you could technically extend the class and override the parent methods).

If you're wanting to change the front-end elements only, you can use jQuery to do your bidding. If you need to add additional processing on the backend, you're out-of-luck with this plugin unless you fork it.

If you're intent on changing the plugin, I would create a GIT repo to track the changes of the original with your edits. GIT will identify the diffs for you.

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