Comodo Positive SSL and Direct Admin hosting panel

Hi. I want to know, how to install Comodo Positive SSL in Direct Admin hosting panel.
I bought and I have in arhive 4 files:
AddTrustExternalCARoot.crt
COMODORSAAddTrustCA.crt
COMODORSADomainValidationSecureServerCA.crt
trendsprogress_com.crt

But in manual https://support.comodo.com/index.php?/Default/Knowledgebase/Article/View/1026/37/certificate-installation--direct-admin-control-panel only AddtrustexternalCAroot.crt and yourdomainname.crt. How to add all correctly?