Visit Hostinger.co.uk to choose your domain!
Type in your domain you wish to purchase and check it!
Then select what extension you’d like! 
Once you selet one add it to the cart
Continue to checkout and choose a payment method…
Selected PayPal in this case
Login to PayPal and confirm the amount and proceed to final checkout…
Done! How easy was that!
Click continue to cPanel! Now at the top hit “Domains” and then you’ll be presented with a similar screen
Now the waiting game begins…Visit this thread here on how to point your domain to 000webhost! 