How does a User manually install a Certificate For Apple/OSX?

1. Download Blacksands required client certificates
   1. Blacksands_Inc_CA_Root.crt
   2. Blacksands_Inc_CA-I.crt
   3. Blacksands_CA_L3-I.crt
2. Right click each of the certificates and select and select Open With Keychain Acces
3. Open Keychain and search for blacksands inc ca root then double click on  Blacksands Inc CA Root
   1. 
4. All the other certificates will now be trusted.