Can I add iOS 10 to iPad 3 - Tablets & eReaders

plug it into lappy ,open itunes see if the update is there.if not that will prob be the end of line .so no ios 11 you be stuck on ios 10 as ipad older

According to a press release from Apple in 2016, the iPhone 4S, iPad 2, iPad 3, iPad mini, and fifth-generation iPod Touch will not run iOS 10

What iPad do you have? If it's on the minimum required list of apple for iOS 10 you can simply use the system settings app to search for updates and get the updated iOS.
iOS 10 Wikipedia

If you mean update your iPad to iOS 10, there are two ways for you: update over the air or with iTunes. Here is a detailed post:
How to Install iOS 10 on iPhone iPad

The current iOS is 8.1. If you want to update your iPad,

• make sure you have iTunes on your current computer;
• connect your iPad via the USB cable included with the iPad;
• select your iPad in the iTunes menus;
• click the "Check for Update" button in the Summary screen.

iTunes will display a message that will either allow you to update your iPad, or let you know that your current version is updated. For First Gen iPads, the latest iOS is 5.1.1.

If you need further help, reach me via phone at https://www.6ya.com/expert/john_77bb351c0c06b354

Unfortunately you can only update to 5.1.1 for the ipad1

if you have laptop/desktop computer you can sync the iPad with iTunes and download iOS 8.1.2 there:
Upgrading iPad to iOS 8: Through iTunes 1. Backup your iPad
Open iTunes. Select your iPad in iTunes and click Back Up Now.
2. Restart your iPad and your Computer
3. Download and Install the Update
Go to iTunes -> Select iPad -> Check for Update -> Click Download and Update

Whichever method you choose, the process will take quite some time to work depending on how much free storage you have on your iPad, your internet connection, and how Apple's servers are doing with upgrades. Occasionally, Apple will either not let you download the upgrade or it will fail. For iOS 8, you must have an iPad 3 or newer. This does not work with the original iPad - if something goes wrong, restart your device, and try again.

How to Upgrade to iOS 7 on an iPad or iPad Mini
How to Install iOS 8 When Your Device is Low on Storage

Click the seTTINGS app,

in the left margin, go to mail, contacts, calendar...

click ADD account.

Then fill in dialog boxes

the first gen. iPad is not compatible with iOS 6:
Download Apple iOS 6
Apple iOS 6 Finally Available for Download Direct Download Link