How do you alter the length of the steel mesh watch strap on a Mondaine watch strap?

I feel this should be a simple matter, but cannot see how to release the clasp and move along the steel mesh watch strap.

You gotta love simplicity. Every woman – and let’s face it, every man – needs a nice, classy watch that they can wear every day. Because you can’t wear diamonds every day.
Well, at least most people can’t wear diamonds every day….
But every day needs a bit of sparkle.
Please check and read this article:

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Luminox Men’s 3903 Original Navy SEAL Dive Watch $180.00 This Luminox Men’s Original Navy SEAL Dive Watch features a unique illumination system that glows 100 times brighter than other luminous watches, making it the perfect choice for low-light or non-light situations. This versatile timepiece is constructed with a polyurethane, 43-millimeter case. The durable polyurethane band is accompanied by a Velcro closure. Stand-out Arabic numerals adorn the ric…