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For more information on theming in Cloud, you might find the Theming Your Community section of the Jive documentation helpful.
For the icon portion, it might be possible to update these as it appears these are found within a widget/tile in your instance. As such I would suggest reaching out to the developer of this tile/widget as they might have a guide they could provide you with.
Lastly, if you are interested in engaging with our Professional Service team I would suggest either reaching out to your account manager or submitting a case in your customer group ( MyJive Secret Support Group Administration FAQ ) where a member of our support team can request an engagement on your behalf.