How to delete a file??

I am trying to delete a file. It says to do so, I need Adm permission. It even names me as Adm, but won't let me delete the file. Just keeps repeating same message (You need Adm's permission).

OK - so, as Administrator - how do I give permission? What do I have to put in to do this?

Hope I explained this clearly. This matter comes up several times when I want to delete a file - but I never can because I don't know what to do to give permission. Therefore, I have files I don't want on my laptop.

Any help you can give this "Very Non-Techwise" Senior will be appreciated. Thanks.

Trying To Help2015-01-19T09:48:53Z

Dear Administrator
Make sure the user you are signed in is the Administrator's user