Can't save settings

By default things in the settings are set to Australian dollars and the rest of the settings are pretty much blank. I can change them just fine, but there is no save button anywhere on that page so I can’t save the settings. If I can’t save the settings, then I can’t use the plugin.

It seems like all of the WordPress invoicing plugins haven’t been updated in quite some time and are broken. I can’t use this or WP-Invoice now. Would love to use this one because it’s better and to be able to move away from manually building invoices…..but I can’t…

Please fix ASAP