In order to open order client list click on the gear icon at the right top corner, navigate to "Orders" and press "Order clients".
If the order client has not yet accepted the original invitation and the status is still "Invited" you have an opportunity to send a new invitation by email or share the invitation via link. Click on the arrow next to the pen and choose the alternative that suits you best.
Find the row with the order client's details and click on the pen.
Locate the line with the client's information and click the "Archive".
Click the "Show archived" at the top right corner. Locate the line with the client's information and click on "Restore".