You need to be a leader to create a macro. The syntax is rather complex so you need some programmin skills see Templates created for the SPC project
AFAIK there is not per se an ability to create a macro, although some suggestions were given the last time you asked: http://www.wikitree.com/g2g/68627/how-do-i-write-a-macro
What would you like the macro to do? Templates can have certain macro-'esque' abilities.
If it regards formatting of a repeatedly used source, as per your previous question, you may also be interested in perusing the entire discussion in my post here: http://www.wikitree.com/g2g/72848/should-we-give-sources-their-own-pages