you need to activate the SSL cert first at Goddady and then tell us what web server you have installed on your droplet VPS so we can provide you the rest of the steps.

make sure to ask Godaddy about the installation procedure because a small mistake can change things in ultimate way. meaning if your SSL signed with www.mydomain.com is it not the same as if it was signed with mydomain.com

please make sure with Goddady first...

Good luck!!

What web server are you using? First you need to Download your SSL RAR/Zip/Tar file from GoDaddy, extract it to your temporary folder. That the extract files usually contain the yourdomain.crt and yourdomain.ca-bundle.

APACHE
========
- If Apache, follow the instructions on the steps to create a ssl folder:
https://www.digitalocean.com/community/articles/how-to-create-a-ssl-certificate-on-apache-for-ubuntu-12-04

- Generate SSL using goDaddy methode on ssl folder:
http://support.godaddy.com/help/article/5269/generating-a-certificate-signing-request-csr-apache-2x

Edit Apache default-SSL configuration (READ STEP FOUR) :

SSLEngine on
SSLCertificateFile /etc/apache2/ssl/apache.crt
SSLCertificateKeyFile /etc/apache2/ssl/apache.key
SSLCertificateChainFile /etc/apache2/ssl/yourdomain.ca-bundle

* add line SSLCertificateChainFile and add yourdomain.ca-bundle from GoDaddy file

Change apache.crt and apache.key your extract file.
apache.crt = Your .crt file / example : yourdomain.crt << GoDaddy crt file
apache.key = Your .key file / example : yourdomain.key

Don't forget to enable SSL mod:
sudo a2enmod ssl

NGINX
======
- Follow the instructions on the steps to create a ssl folder:
https://www.digitalocean.com/community/articles/how-to-create-a-ssl-certificate-on-nginx-for-ubuntu-12-04

- Generate SSL with goDaddy method on ssl folder:
http://support.godaddy.com/help/article/3601/generating-a-certificate-signing-request-nginx

Edit NGINX default-SSL configuration (READ STEP FIVE):

ssl on;
ssl_certificate /etc/nginx/ssl/server.crt;
ssl_certificate_key /etc/nginx/ssl/server.key;

Change server.crt and server.key your extract file.
server.crt = Your .crt file / example : yourdomain.crt << GoDaddy crt file
server.key = Your .key file / example : yourdomain.key

* "yourdomain.key" is your generate SSL file using goDaddy method.
* Copy all extract files to Apache/NGINX SSL folder
* Restart your web server (Apache/NGINX).
* Remove your temporary extract SSL folder.