If you install two Content Management Systems in the same folder, the second one will most likely overwrite identically-named files for the first one. In this case, the index.php file, which controls the first page of the site was overwritten. There may be others as well.
The best thing to do is to remove both Joomla and WordPress from your account and then reinstall the one you want. If you want to test another one, feel free to install it, but be sure to install it into a subfolder, perhaps named 'test' or 'joomla' or 'wp', anything really.
Once you have cleared out the installs and re-installed the one that you want , you should be able to access both the front and back ends without issue.
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