ppa problem: how to add ppa to repositories ?

Do you mean start your own PPA, or add a PPA so you can install apps from it?

https://help.ubuntu.com/community/Repositories/Ubuntu
check this link in add ppa in the middle its asking me to get the address of ppa ,how to get that

Well, which PPA do you want to add?

Step 1: On the PPA's overview page, look for the heading that reads Adding this PPA to your system. Make a note of the PPA's location, which looks like (for example):

ppa:gwibber-daily/ppa
so how to open ppa overview page to get my ubuntu required ppa location

pls reply.any more info u want

Have a look at the page, click on 'read about installing'.
https://launchpad.net/~gwibber-daily/+archive/ppa

run:

sudo add-apt-reopsitory ppa:gwibber-daily/ppa; sudo apt-get update; sudo apt-get install gwibber

NB. If you use a PPA and get issues, you will not be supported in #ubuntu on irc.freenode.net as you are using a 3d party software source