Your motherboard's
manual on page 11 (of the PDF itself, not the printed page numbers) shows that there are two USB 2.0 headers and one USB 3.1 header. Two of the headers (USB 2.0 and USB 3.1) are on the right side of the board, between the 24-pin ATX connector and the SATA connectors, and the 3rd header (2.0) is on the bottom, middle/right area. Keep in mind where the blank spot is on both the mobo header and the plug, as they indicate which direction to plug into. They can only go in one way.
The front panel connectors for the power/HDD LEDs, power button, and reset button are on the bottom right, labeled as PANEL1. Page 23 of the manual shows where exactly each wire connects. For some connections, the polarity (+/-) doesn't matter, however it's recommended to place them all in their matching parts anyways to rule out any possible problems.
The front panel audio header is located on the bottom left of the mobo. It will most likely be a single 9-10 pin connector, not separated like the power/LED connectors are. If not, page 25 shows which pins go where.