Manually mount SD card in running system?

[lsitongia]

I haven't found a distro yet that will automatically mount an SD card in the phone. I'm running Manjaro Plasma beta2 right now. Why doesn't the SD card automount when booting the phone? I've made sure that the SD card isn't bootable, so it doesn't interfere with booting the phone. The SD works fine when it contains an OS image or the jump drive.

How do I go about manually mounting the card? I want to use it for file storage, music, etc.

Thanks for your help!