If you are asking how to type an alpha with macron and acute accent on the forum, I can't help you. If you are trying to do this in your own files, you can use the New Athena Unicode font (do a Google search for it). It has non-standard Unicode characters, including alpha with macron and acute accent. The problem then is trying to figure out a good way to get these characters into your files. I used the Character Map program (on Vista) to get the special characters, and then put them into a file that I can cut/paste from.
I, Lex Llama, super genius, will one day rule this planet! And then you'll rue the day you messed with me, you damned dirty apes!