You can use this form to acquire a license for the use of a single track, on a specific date, at a specific venue. For €4 you are then allowed to give an unlimited number of performances on that date and at that venue for audiences of unlimited size.
If you wish to use more than one track, or perform on more than one date, it is generally better to acquire a multi-use license. For example, for €10 you can get a one-year license to use 3 tracks for an unlimited number of small performances for audiences up to 300 persons and one large performance during that year for an audience exceeding 300 persons. More information can be found here.