Go to the "Your Reimbursements" section and tap on "Fill out a Claim Form". To answer the first question, click on the checkbox (small square in the first column of the table).
You will then be asked to enter information about your medical treatment and upload the corresponding invoice documents.
Please note that only one claim with all invoices and reports can be submitted or uploaded for reimbursement per insured person. This will subsequently facilitate faster processing and handling of the documents.