Ok, my bad - I didn't explain enough...
You have to do this through what are known as 'Account Settings'...
There is the 'Defaults' account now, that you will see on the right - dbl-click that, and explore the tabs... see?

Now, understand that you can create Groups, and as many custom accounts in each group as you want, each with its own settings.
As you create these groups, they will inherit the settings either from the Defaults, or, you can 'Copy' (right-click on an existing an account) an account, and the copied one will obviously 'inherit' the settings of the account copied...
If you haven't read
the manual, it is highly recommended that you do so. It is outdated, but most everything still applies in one way or another.
The documentation is in the process of being updated, and hopefully in a few weeks
the wiki will be replacing all of the documentation on the website...