HT4623 How do I get the accessibility icon to show in my general page to receive automatic updates

Question

How do I get the accessibility icon to show in my general page to receive automatic updates

Answer 1

If you mean the Settings > General > Software Update option then that will only show when you have iOS 5+ installed, if you have iOS 4 as your tagline suggests then you can only do the update via your computer's iTunes, as described half-way down the page that you posted from.
Connect the iPad to your computer's iTunes and copy any purchases off the iPad to your computer via File > Devices > Transfer Purchases. You may also want to copy photos and any important documents off the iPad as well e.g. via the file sharing section at the bottom of the device's apps tab when connected to iTunes, via wifi, email, dropbox etc - they should be included in the backup, but it's best to have a copy of them outside of the backup just in case. You can then force a backup of the iPad by right-clicking the iPad 'Device' on the left-hand sidebar of iTunes and selecting 'Backup' (on iTunes 11 you can enable the left-hand sidebar via option-command-S on a Mac, control-S on a PC)
Then start the update by selecting the iPad on the left-hand sidebar, and on the Summary tab on the right-hand side clicking the Check For Updates button
Updating to iOS 5+ : http://support.apple.com/kb/HT4972
You can only update a device to the highest iOS version that it supports, which for a first gen iPad is iOS 5.1.1, and for other iPads is iOS 6.1.3