In this post I'll try to give as much information as possible, on what to do when you have a problem on your account or on your computer. You can always ask for information here aswell. We will try to help you out or redirect you to a thread with more information.

The Support Centre: Forum Thread (click here)
Runescape Wiki: Home / Game Info / RuneScape Wiki / Support Centre (Here you'll find Account help, Technical Help and Payment Help info. You'll also find the Safety Centre and a link to submit a bug report.)

Account Help: Forum thread (click here)
Runescape Wiki: Home / Game Info / RuneScape Wiki /Account Help (The link towards the Account Help Wiki page, can be found in the forum thread.)

Safety Centre: Home / Game Info / RuneScape Wiki / Safety Centre
Safety & Security: Forum thread (click here)
Runescape Wiki: Home / Game Info / RuneScape Wiki / Safety & Security

Technical Help: Forum thread (click here)
Runescape Wiki: Home / Game Info / RuneScape Wiki / Technical Help

Billing Help: Forum thread (click here)
Runescape Wiki: Home / Game Info / RuneScape Wiki / Payment Help

More helpfull information:
- Account related issues: accounthelp@jagex.com
- Jag (Jagex Account Guardian) related queries: jag@jagex.com
- Billing related issues: billingsupport@jagex.com
- Computer Security: Home / Game Info / RuneScape Wiki / Computer Security
- Basic Account Security: Home / Game Info / RuneScape Wiki / Basic Account Security

NOTE:
- Never post private information on this thread, or on the RuneScape Forums!
- An issue between You and Jagex? Send them an Email.
- Only send an Email when you can't find the solution to your problem(s).