Max. size mediafile upload: 2 MB. (?!)

Dear reader, I like the Gridalicous theme very much: I use it to create a website for my choir. That's why I want to upload audio mediafiles: fragments of recordings of our concerts. The website is still offline, on localhost. I am able to upload mediafiles up to 2 Mb., which is far too small for any soundfragment. Please help me out! Thank you very much. Mirjam