Firstly connect to the switch using the default details:
IP Address: 192.168.0.1
Once connected navigate to the follow menu location:
Configuration --> System --> IP
On this menu you will see 'IP Interfaces'. Untick the IPv4 DHCP check box, then edit the IP address shown in the address box to the IP address you would like to assign to the switch, and click 'Apply' at the bottom of the page. Your switch will now be unavailable as it has changed its IP address.
Adjust your PC in to the correct range and connect to the switch using the new IP address.
Please note that your switch may take a minute or 2 to commit the new IP address and boot up again.
Once everything is confirmed as working, log in to the switch and click the Disk icon in the top right-hand side of the switch web page. This will commit the changes.