What is it called to type on multiple lines? How do I do that on aptana ?

I believe you are looking for Word Wrap.

Try going to Preferences > Aptana Studio > Editors and check the "Enable Word Wrap". It's the last checkbox in that menu.

Also you can right click on the Line Numbes of a file and select Word Wrap.

Sorry I meant I wanted to edit multiple lines at once by having multiple places i was typing at the same time.

Ah, you are looking for Block Selection. There is a button at the top to enable the mode or you can use OSX shortcut command+option+a. Once that mode is on you can drag a box around multiple lines. You can also put your cursor somewhere and hold shift while hitting down arrow.

I think it might be called having multiple insertion points. I was able to do it on the lynda.com editor by command clicking in multiple places in the code then just typing.