X-Plane help!!!

[denhamjosh18]

Cheers guys

I ve already taken a peep at the manuals and they are very helpful, the thing is that i know it has stuff about the a/p but when im reading it in the manual, I sort off get some of it (or all of it) but when I come to fly, the alt hold keeps on turning its self off and then when i turn it on it sets itself to the alittude that im at at that moment

So... my question is how do you set it up properly ??

Thanks, Josh