Lg Nexus 4, how do you delete pics from gallery

[redpac]

I have a Lg Nexus 4, great phone, but I am not able to delete pictures taken with the camera, and most of them end up in the picasa web album upload? dont know why? of mine into gallery. In an attempt to eliminate them, I even removed those albums from my picassa web album. Does not give a option to delete:'(

Can any one help please

 

[josegb2011]

You must have instant upload active from Google+ which means every picture you save will upload there..you must delete them from your Google+ account