Help with Wordpress Install url

I have bought a domain and am hosting it for free on 000webhost. I have changed the nameservers on my domain to those of 000webhost. Now i wanted to install wordpress. Before the start of installation, it asks me for the url where I wordpress should be installed. i want to install it on the domain which i have bought, but there is only one option of the free domain provided by 000webhost. Should I go ahead with it?

Yes, go ahead with it then change the wordpress domain later by following this tutorial