FuM can have up to 29 members and an equal number of substitutes. FuM consists of both members appointed in a general election as well as members appointed by the sections. The general election, the union election – kårvalet, is organised by the Election Commission in October each year. All students at Karolinska Institutet who are members of MF can send in their candidacy for a seat in FuM as well as vote in the union election. 15 of the 29 mandates in FuM are reserved for the sections, and the remaining mandates go to members appointed in the general election. At their first meeting, FuM elects the speaker, vice speaker and secretary who lead the FuM meetings.
FuM meets at least three times per semester to discuss and decide on the overall issues concerning the entire student union, such as the budget, activity plan and election of positions of trust. All MF members are welcome to the FuM meetings, but only members of FuM and union bodies and the Inspector and the Board have the right to speak. The members of FuM are the only ones who can vote. The documents of FuM are in Swedish, but the spoken language at meetings is usually English.