You land on runway 27 and slow to taxi speed. Once clear of the runway (having exited via a taxiway), you transmit:
"Wels Radio, D-EFGH, on the ground, vacating via taxiway Alpha."
The operator confirms:
"D-EFGH, ROGER."
You are now on the apron or taxiing to parking. You may continue on the frequency if you plan to remain at Wels for a time. If you are ready to depart and your engine is still running, you would remain on frequency to request taxi information for your next departure. Otherwise, you may switch off the radio or reduce volume.