Depending on which SSL type and vendor you have purchased, you can refer to the complete guide prepared by SSL Vendor to install the SSL Certificate for your domain.
Symantec
https://knowledge.verisign.com/support/ssl-certificates-support/index?page=content&id=AR212&actp=LIST
GeoTrust
https://knowledge.geotrust.com/support/knowledge-base/index?page=content&id=SO15065
Comodo
https://support.comodo.com/index.php?_m=knowledgebase&_a=view&parentcategoryid=95
