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How to search for High Rated manga
1 On the Top screen, Choose Yaoi, Shoujo, etc.
2 Choose Sort by : Popularity
From that page, you can do more advance search..

Thanks

You're welcome.. Don't forget to mark the manga you read / follow into 'READING or READ' so you'll get the new update notification!

Depends on what genre you prefer. You didn't mention which one so check these out for starters -
http://www.mangago.me/home/mangalist/35626/ (shounen+seinen)
http://www.mangago.me/home/mangalist/53203/ (shoujo+josei)
http://www.mangago.me/home/people/57609/list/ (BL+everything else)
Majority of the Mangago regular users have personal lists of their own "5 star/highly rated" mangas. So you can specifically visit their homepage/their lists to pick out mangas you prefer too. For example you can surf around the user's lists you are already following if you have a similar taste with them.
As to how to check out an individual users list - go to your own homepage>click on any of user's username you are following>you are now on their homepage>click on the "list" option under their username on the top left part of the page, that appears along with several other options like home,activity,manga,album etc. >now you are on their list page.