If you quit runescape...
You must do the quest Freminik Trials
After Completing the Quest Fremminik trials begin the quest Fremminik isles then go to neitiznot and the yaks are there
its part of the quest a voids dance
Find and talk to Brundt in the main building in Relleka with the quest icon.
you can't start a quest until you have all requirements, requirements are listed on the quest page in the log
If this is for Monkey madness quest, the person you are looking for is Glough.
It's currently not possible to undo a quest in RuneScape.
The legends quest on runescape is not gone, I suggest that you check again.
A quest on Runescape is an adventure that puts you in a conflict, you solve it and you get rewards like money, skill experience points, quest points, and items.
There are a couple I suggest, if your are F2P then train on white knights, if you are P2P train on Yaks (If completed Fremennik Trials quest,) or train on Rock Crabs.
To get to Neitiznot on RuneScape you must have completed the "Fremminik Trials" quest. This will allow you access to the Fremminik Isles. When you have completed the quest, all you have to do is talk to a person on the pier just to the east of the rock crabs in Fremminik, and ask him to transport you to the island. If you need to go to the neighbouring island of Jatizo, then all you have to do is talk to the other person at the same pier.
There are many websites where one can get advice on completing a Runescape quest. The Runescape website itself offers advice as does the website Tip.It.