About getting through to upgrade a seat on Kuwait Airways, you can choose to get what is needed done by following the online process. You can go through the steps below for the help, and then go through the assistance you are looking for: 

Flick through Kuwait Airways' official website, www.kuwaitairways.com. 
Tap on the Manage Booking option and salvage the reservation using the passenger's reference number and last name. 
Then, on the summary page, click the menu icon list and choose the upgrade option. 
You shall get a form to put in a request for an upgrade. 
If available, you shall receive a confirmation, and upon paying for the same, you can successfully upgrade the booking.
You must first learn about the possibilities for these upgrades and then confirm the modification. 

What cost do I have to pay for a seat upgrade on Kuwait Airways? 

The booking must be upgraded to travel in a higher class. If the reservation is in a lower class, you can pay a Kuwait Airways business class upgrade fee. For the booked tickets, you may pay a fee between $400 and $700, depending on various factors. These factors include the fare rules of the booking, booking class, travel routes, etc. 

Is it possible to get a free upgrade to business class? 

Though a free upgrade to business class can be done only with limited tickets, with almost all bookings, it is not possible. Thus, read through the booking rules well in advance to get free upgrades. But with the tickets booked on any elite class, they can help you get free upgrades and additional benefits.