how do I give an ipad app while I have an iphone?

If it's an iPad only app, you can try to find it through Safari, by entering the app name followed by the word iTunes in the search bar or Google search or other search engine.

It should result in a link to the App Store entry for the app. Tapping it should then open your iPhone's App Store app to the app's webpage.

If it's an iPad only App, you won't be able to buy it yourself, but the Gift App option should be visible when tapping the share icon (arrow coming out of a box).

Odd, yeah it may be a glitch. Should have the Gift form there.

Does it work if you try to gift another App? Don't complete the form or anything just see if it comes up correctly.