Hi skrlegel,
Welcome to the world of MODX.
It looks like you've installed your MODX cms into a folder within your webroot called '/modx-2.5.5-pl/'. Ideally you should place the MODX cms into the webroot if that's where you want it to start. You can then set the site into maintenace mode and setup a coming soon or holding page and specifying this as the maintenance page in your system settings until you're ready to launch.
You have a few options here to rectify this:
A) You can move the files within that folder to the webroot and then proceed to edit all of the MODX related config files to point to the new path. Refer to the config paths mentioned in this article for assistance
https://docs.modx.com/revolution/2.x/administering-your-site/moving-your-site-to-a-new-server
If you're new to MODX though do please take a backup first as be very melicilious about changing the paths as inserting a wrong path will result in your site not loading correctly or at all.
B) You can ask your host to edit the document root of the domain to start at /modx-2.5.5-pl/ instead of (most likely) /public_html/.
To change the site start you can do this by going into the MODX system settings in your manager (/manager/?a=system/settings)and searching for 'site_start'. You can then edit the number to the new resource ID that you want the site to start at (default is 1)
[ed. note: lkfranklin last edited this post 6 years, 6 months ago.]