Sadly, you are not able to upload or amend an address in iQ-Energy which is Scottish, as these are managed separately by EST.
To make changes, simply open this form: http://quidos.co.uk/wp-content/uploads/2015/04/Scottish-EPC-Missing-Address-Form-2015-01-13.pdf
Complete the sections applicable and then email the form to: epcmissingaddress@est.org.uk