Add page length to bottom?

so i've been using photoshop religiously 8 years now, , year started getting more heavily involved indesign , few differences still confuse me more help. i've run problem want add inch or bottom of document, not top. in photoshop can canvas size, , choose anchor point page size added too. in indesign, can use document set up, or in pages tool can edit page size, no can find way edit page sized based on anchor point?

with page tool can fix proxy in control bar page extended or reduced. not recommend change page size tool except have di single page only.

 

but aware object program ai or id way different pixel programs photoshop. method how page elements used different.

 

normally indesign uses margins , guides align when layout adjustment done. should done via layout adjustment. use of such guide lines important. problem people draw frames without connection guides. cause huge problems.

an alternative way use liquid layout policy have different rules adjust content when page sizes change.

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