how to get the id of long text?

Question: can someone help me to get the id of long text?
I had serached in the forum.I think it's a good idea to search the id in the transaction use goto --->header.
but how can i do it? for example, in the transaction code MM02. i select the purchase order text view. now in the menu i can find goto button.but i just find back button under the goto. Can somebody tell me why?

apprecied your help!

Answer:
You must be in the text editor... there is an icon just under the languages section.

Then Goto->Header.

Regards.

Answer:
Found using "purchase order text" in SEARCH....
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