Sorry for the delay in response. Your website isn't loading for me.
There's a few options to try:
1. Use modules anywhere:
If you want to add the link as a menu item, we recommend using the Modules Anywhere extension to display the SCLogin module in your menu. For more information on Modules Anywhere, view the documentation found here. Joomlashack also offers a tutorial of setting up a menu item with a module found here. Choose an instance of SCLogin and use the ID of the SCLogin module instance in the menu item. Then simply configure your SCLogin module parameters to display a Modal Popup and decide on whether the Modal Style 'button' or 'text' fits in with your menu best. Additionally, if you want to customize the text of the link, you will need to edit the mod_sclogin language file for the following strings: MOD_SCLOGIN_LOGIN and MOD_SCLOGIN_REGISTER_FOR_THIS_SITE.
2. Create a custom position:
On sourcecoast.com, our Log In and Register links are not actually part of the menu. We are using the SCLogin as a module and displaying in a template position near the menu. The module has then been styled to have a consistent look with the menu and is set up to use the 'Modal Popup' view type and 'Text Links' to launch the modal.
3. Try the menu position for the template (or one that will get it to the closest position), adding a module class to the module and then writing targeted CSS just for the module.
-Melissa