You should try the following things:
If all the above doesn't work, the fall-back option would be to download the Runescape client from the website, downloads section.
You can always just turn it off with external switch on the computer.
Testing: Can I leave a message when a syntax error shows up for this page on my computer? Testing: Can I lease a message even though I see a message that says 'syntax error' on this page on my computer?
Reset your browser, then re-load the runescape page again.
because
u must have made typing error
403 Error generally means that you are forbidden to view it, either threw the website (i highly doubt since its twitter), or a program on your actual computer.
You can make a RuneScape account by going to the home page.
Typically this means that there is either an error in your web browser, or that you have an infection in the computer. Try using a different browser, if a similar issue continues, take the computer to a professional for Virus or SPyware removal. Just because you have protection installed does not mean that you are actually protected.
I cannot connect to my profile on Twitter. It keeps on saying error on page
The RuneScape downloads page only contains Jagex's (RuneScape's development company) supported content, thereby meaning that all content provided is safe. It's really a good idea to only download RuneScape content from the official source and nowhere else to minimize the risk of getting a virus or malicious infection on your computer.
It doesn't.
Try and looking on the purchase runescape membership page.