1
The servo block needs to be assembled before you can use it - finf the parts in the picture from your kit. You can click on the picture to zoom in.
2
Using the 2 bolts and nuts, fix the servo into the board like the picture.
3
Push the 4 spacers into the holes - be careful, the ends are different! The end with the step should be pushed into the board - you will have to look closely.
4
You can also use the brackets and bolts to mount the servo horizontally if you want.
5
Finally, you need the small screw from the other bag of parts - keep the rest of them, you might want them for advanced projects later!
6
Push on the large servo arm, and hold it in place with the small screw and washer. That's it - you can now attach other things to the arm with the larger bolts and construction kit parts.