Use the strap tool included in the bottom of your watch case for changing both leather and mesh straps. You can also use a similar, small item with a narrow point (like an earring or a needle) to change or adjust the size of your strap.
Use the narrow end of the tool to push the spring bar through the hole from the side of the lug. When pushed, the spring bar will loosen from the hole and can easily be detached from the other lug.
Detach the strap from the watch and remove the spring bar from inside the strap. The same bar will be used to attach the new strap.
To attach a leather or a mesh strap, push the spring bar through the hole in the watch strap until both ends are visible.
Place one end of the spring bar in the hole in one lug and push the other end into the hole in the second lug to attach the strap.
Pull the longer strap piece out through the metal loop.
Remove the watch case by sliding the watch case out of the strap.
Place one end of the spring bar in the hole in one lug and push the other end into the hole in the second lug.
Prepare the new strap by separating the two strap parts from each other. Pull the longer strap piece up through the metal loop.
Start at the top of the watch case and insert the long part of the strap from the front of the watch to the back through the opening between the watch case and the spring bar. Pull the strap and insert it from back to front through the opening at the bottom of the case. Slide the case to the middle of the strap.
Insert the long end of the strap through the metallic loop at the end of the shorter part of the strap.
Use the strap tool included with your watch to adjust your mesh straps. You can also use a similar, small item to adjust the size of your strap.
Use the thick end of the strap tool to lift the clasp.
Slide the clasp to adjust the length of the strap.
Push back down to secure the strap.
How to adjust your Mesh strap: Watch here
Open the watch by pressing the two buttons on the side of the butterfly lock.
The strap side that has holes in it is the changeable side.
Take the pin out from the hole and adjust to your preferred hole.
When moving the pin to a new hole make sure to lift it so you don't scratch the surface of the watch strap.
When closing the butterfly lock make sure to close the fixed side first and then the adjustable side. And then add the strap holder loop onto the strap.
How to adjust your Iconic Motion strap: Watch here