Thank you for your post.
After you enter the details and tap Done, make sure the host connects. Once connected to the host, then go to Recent, and the host should be listed. If not, then try rebooting FileMaker Go and connect again. If this still fails, then reinstall FileMaker Go, and with nothing listed under Recent, tap Hosts, tap Add Host, enter the details again, tap Done, let FileMaker Go connect to the host, and then tap Recent to see the host listed.
Let me know if you continue to run into difficulty.