Hi @Calvin_Liem,
First of all apologies for the late reply. You haven’t categories this topic under rtMedia so may be that’s why it doesn’t get any attention. For the reference this is not premium support, it’s community support forum, we have mention that at top in home page of community forum -> http://community.easyengine.io/
You can check your album gallery under media tab and from there you will get to know which album id it is. For example, suppose you have album url like this {site_url}/members/admin/media/2179/ than 2179
is the album id of that album. The same way you can find the favlist number. Author is nothing but the user id, which you can get from WordPress backend by checking users page. Context id is related to context, suppose you have context set to profile than context id will be user’s user id and if you have set context set to post than context id will be post id.
All this things are already mentioned in docs -> http://docs.rtcamp.com/rtmedia/features/shortcodes/gallery-shortcode/