You can do this by logging in and clicking the 'Promote now' button in your profile, exhibition, or artwork settings screen.
You can be featured for a whole week for just 5,90 € - If you still have 'credits' left you can highlight your work by clicking on the button.
Otherwise you can go to your payment settings "Promotion Overview" and buy on, three or 10 promotion credits via Credit Card, Paypal and many other payment options.
When you use a promotion credit your location or exhibition will be illuminated red on the map like the Glarify logo, and you'll be represented in the promoted rank for one week. It's cheaper than printing flyers and a much better way of attracting art fans who use Glarify.
This is how your glare will look like on the artmap: