how do I get rid of AthenaSearch?

Some context would help, but I'm willing to speculate it's adware.

Whatever it may be is easily fixed. You just have to identify the culprit and delete the files responsible for its appearance. The following steps will lead in that direction.

• If you want to "read ahead" to learn what's involved, the solution follows the format of this recent Discussion: Adware Safe Finder - new removal techniques?

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Navigate to the following folder, and post its contents in a screenshot:

~/Library/LaunchAgents

To open that folder, copy the entire line above and paste it in the Finder's Go menu > Go to Folder... field. Make it look like this:

... and click the Go button.

A Finder window will open. Take a screenshot showing all that folder's contents, and post it in a reply. To learn how to do that please read the Appendix in the following User Tip: Writing an effective Apple Support Communities question.

Usually, there is nothing in that folder so don't be surprised to find it empty. The reason for starting with that folder is to eliminate other potential causes before proceeding with steps that will identify and eradicate whatever is affecting that Mac.

There will be additional instructions to follow and this is just the first step.

Hello,

Where are you seeing AthenaSearch?

Writing an effective Apple Support Community post