We are currently working on improving certificate features within RhoElements. The best I can advise at the moment is to disable the certificate authority verification so that it loads the certificate automatically. To do this add the following line into the bottom Navigation section in Config.xml:
<VerifyPeerCertificates value="false" />
Please note, this is slightly different from what is specified in the Configuration Parameters documentation page: http://docs.rhomobile.com/rhoelements/ConfigurationSettings as it states to set this to "0". This is a recently found bug which we are looking to fix.