In case you are accessing SMF by the server's address you may experience problems because of incorrect url paths. In order to fix them follow these steps:

1. Log in cPanel and click on 'phpMyAdmin' from the Databases box. Then select the SMF database from the drop down box;

2. In the table 'smf_settings' make the following changes:

smileys_url: http://serveraddress.com/~username/SMF_FOLDER/Smileys

avatar_url:http://serveraddress.com/~username/SMF_FOLDER/avatars

3. In the table 'smf_themes' change:

theme_url: http://serveraddress.com/~username/SMF_FOLDER/Themes/default

images_url: http://serveraddress.com/~username/SMF_FOLDER/Themes/default/images

theme_url: http://serveraddress.com/~username/SMF_FOLDER/Themes/classic

images_url: http://serveraddress.com/~username/SMF_FOLDER/Themes/classic/images

theme_url: http://serveraddress.com/~username/SMF_FOLDER/Themes/YOURTHEME

images_url: http://serveraddress.com/~username/SMF_FOLDER/Themes/YOURTHEME/images

If you have problems making the above changes you can use Siteground's Development services.