Q: Applemac OSX 10.7.5 How do I spot pop ups appearing every time I click the mouse on-line. this has only just started.have I clicked something  wrong??

Safari - Preferences - Extensions and then add AdBlock to block pop ups.

Go to Thomas Reed's website: http://www.thesafemac.com and then follow the link to his AdwareMedic program...that is a great little program that blocks and removes adware.  Tom is a major contributor on here and a big help with these issues.

There is no need to download anything to solve this problem.

Please post a screenshot that shows what you mean. Be careful not to include any private information.

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You may have inadvertently installed adware. Eradicating it is simple and you don't have to download or install anything to fix it. For an explanation or how this may have occurred, how to avoid it in the future, and for one possible solution read How to install adware.

Blocking popup windows in Safari and ad blocker extensions can be useful, but they are often ineffective defenses for this particular threat.