Use the admissions application for master's degree courses:

UPC Admissions (candidate space)
To register for the application
Enter a valid e-mail address as your username.
To fil the required information and to upload documentation
You will be sent a password to log into the application. Log in and enter your personal and academic details and upload the required documentation.Once you have entered the details and uploaded the documents, submit the online application form for administrative and academic review. If you would like to pre-enrol in more than one master's degree course, you do not need to re-enter the details you have already provided.
Students must pay a pre-enrolment fee of €30,21
The price applies to each pre-enrolment for a master's degree course run by the UPC. Students who pre-enrol for more than one course must pay a €30,21 pre-enrolment fee for each course. These fees are non-refundable. You may make changes on your application before this payment by entering your username (valid e-mail address) and the assigned password.
Once the payment is confirmed, the status of your request becomes "SENT" 
To check your application status
You will be able to check the status of your application throughout the admissions process.
Notification of the decision on admission
On the date specified, you will receive an e-mail telling you whether or not you have been admitted to the master’s degree. You can also check the pre-enrolment application. Your admission will be conditional until your academic details have been checked.

With the admission confirmation students from outside the EU can begin the procedure for applying for the visa that will cover their stay in the country while they are taking the master’s degree.

You will be able to continue the process by following the instructions you will be sent on accessing the e-Secretaria.