Q: Where is the trash can so I can delete photos?

I have 600 unwanted photos in my Photostream and very little free space on my iPad 4. When I select photos in the "My Photostream" album there is no option to delete them, as shown in other posts in this forum. Icloud ignores them, because they are over 30 days old (why this crazy limitation?)

How the ..... Can I remove these photos? The only option I know is to delete everything by returning the iPad to its factory state, which is not attractive.

Apple seem to have forgotten that people need to be able to manage their data, iTunes is the worst piece of software I've ever experienced and icloud is little better.

Please does Anyone know a solution, which will overcome Apple's omission and allow me to manage my photos myself?

P.S. Sorry about the random capital letters, but this iPad won't let me place the cursor with any precision. That's a question for another day, together with "why does this forum say that I have IOS 6.0.1 on my IOS 7.0.4 iPad?