If you click Config in the root menu the following menu appears:
You have to following options:
Add item
Click this option to add a new item to Radial Menu. Click here for more info about adding new items.
Add group
Click this option to add a new group to Radial Menu. Click here for more info about adding new groups.
Opacity
With this option you can set the opacity for Radial Menu. After clicking this option a gauge will show up. To set a opacity simply point to the value you want and confirm with a left click.
Size
You can change the size of Radial Menu with this option. Move the mousepointer over the values. Radial Menu will resize immediately. Confirm you setting by left clicking the desired value.
Info
This will bring up a info box with version information and a link to the help page. Click on the button 'Check for update' to check if an update is available for Radial Menu.If an update is available you can choose to download and install it.
Close
Quit Radial Menu.