SQL studio connection

Hi, I'm currently looking into using SAP's database manager and SQL studio to store and edit data from a small home hosted website.

My problem is that after creating an "instance" on my computer and ensuring that it is running on the database manager I go to access it using SQL studio and get the following message:

ODBR-Error:[SAP AG][SQLOD23 DLL][SAP DB]Invalid authorazation specification;-4008 POS(1) Unknown user name/password combinaiton. return-code: SQL_ERROR (-4008)

I have done the usual web searches and have not found anything that helps. I have tried case ajustment, using and not using quotation marks and adding new users.

Thanks for any help you can give,

Sam