If you are talking about a specific page, you have the option to show more edit history (25,50,100,250 and 500 edit entries) or to show the next amount of edit entries (at the bottom of the page, scroll down for that, but it also shows this at the top of the page). Notice that if a page hasn't been edited a lot, you cannot select more edit entries.
If you are talking about the wiki wide edits (wiki activity feed or wiki recent changes feed), you can either go to Special:WikiActivity and click at the bottom to go further or use Special:RecentChanges and click the amount of edit entries or timeframe shown at the top of the page (section is called: Recent changes options). Select the bold text and use them on your own wiki search to find the pages i am talking about.
Hope this is clear enough for you. If not, feel free to ask further.