Follow the steps by steps instruction and install Nucleus.
Step 1 : Click on My cPanel.
Step 2 : Under Software/Services section, select Softaculous.
Step 3 : Under Blogs section, select Nucleus.
Step 4 : Click the Install button.
Then, Configure the Software Setup.
Step 1 : If your site has SSL, then choose the HTTPS protocol – if not, either HTTP option will work.
Step 2 : Select the Domain on which you wish to install Nucleus.
Step 3 : Leave this blank to install into the root directory of the above domain name.
Note: If you have other software/scripts installed on this domain’s root directory, make sure you create a new folder and specify its name in this field to complete the installation. If you don’t, you will overwrite existing installations.
Step 4 : Create a Database Name.
Then, Configure the Site Settings.
Step 1 : Choose any name for your new site.
Step 2 : Choose a short name for your new site.
Then, Configure the Database Settings.
Step 1 : Create a Table Prefix.
Then, Configure the Admin Account.
Step 1 : Choose a new username.
Step 2 : Choose a new password. Ensure you record it for future use.
Note : Choose a secure password to ensure the safety of your account.
Step 3 :Choosing an alternate email.
Step 4 :Click on the plus sign beside Advanced Options
leave the Email installation details to field blank. Should you wish to have them sent to another email address.
Step 5 : Enter it.
Then, Click Install.