You can adjust most CLUSE watch straps yourself. When the clasp is opened, you can see a little arrow shaped opening in the middle part. You can flick that part up by inserting a small, flat object in that opening. After it is open, you can move that part of the clasp up or down the strap. Please be aware of the little indentations on the back of the strap. Once you have reached the correct spot, all you have to do is click that part of the clasp shut.
However, if you own a link strap please approach one of our official resellers or a watchmaker to adjust the strap. You can check which of our resellers is closest to you here: https://cluse.com/pages/store-locator
Please note that you may be charged for this service and that CLUSE cannot be held responsible for these charges.