Here is a visual guide. Image by image.
Www.fethiye.bel.tr
Click on the Sikil kodu lie online tahsilat button.
Then click on Tum boclari sec to highlight all the above transactions then click Secili borclari button.
Click the button with the red writing. Odeme islemini Baslat.
You can then enter your card details. Mine is turkish account not sure if a uk card works here or not.
Last page is confirmation. Probably best to print this out just I case we are all donating to charity by mistake lol