First, find the person whose wristband you wish to change.

Click on the wristband number that they currently have, this will be in blue under their pass.

Under Associated Codes, click 'Delete'. This will un-associate that wristband from this pass, and will remove that wristband code from the system.

If you click delete then this wristband cannot be reused, but the person's pass can be linked with a new wristband.

Then, to associate a new wristband, select 'none'.

And then, IMPORTANT: select 'Add'.

And now, scan or type in the NEW wristband number you wish to associate.

Success!

Now, if you search that person's name, you will see they are now linked with that new wristband.