No software update tab

If your iDevice is using a version of iOS lower than 5, you will need to use iTunes on your syncing computer to perform the upgrade. Use the Apple link below as a guide for the upgrade, paying particular attention to the "Update your device using iTunes" section near the bottom.

https://support.apple.com/en-us/HT204204

Information regarding transferring purchases from your iDevice to iTunes on your syncing computer can be found at the link below.

http://support.apple.com/kb/ht1848

Your post makes no sense. Provide more information if you want answers.

What, where, what device are you talking about?

What model is your iPad, and what version is your IOS?

Try

Restart / Reset

http://support.apple.com/en-us/HT201559