I want to be able to change arrows or sight's mid game on ps3 but i don't know how i have done it by accident but i don't know what i pressed please help!

If you wish to change your attachments in mid game press select once (if you hold it you will bring up the match leaderboard). When you access the on the fly menu use the corresponding buttons to change your attachments*.

I hope this helps you, if you have any questions feel free to ask.

*Note: You can only fit unlocked attachments to your weapons.

Thanks a lot this has and will help me a lot