The VMs used in IT labs are not able to interact directly with your browser/system clipboard. However, you can use the "Copy to VM's clipboard" button to copy text from your system's clipboard to the VM's clipboard.
1. Copy the desired text onto your clipboard
2. Click on the "Copy to VM's clipboard button" located in the top right corner.
3. Paste your text in the window that pops up.
4. Then, click "Copy to VM's clipboard"
5. Navigate to the place in the VM where you wish to paste.
Below is a GIF demonstrating this process in action.