re-read my answer, as I've already explained 100% of what you need to do to accomplish your goal.
Your existing in-filter is basically two rules that do the same thing... rule 1 is a passthrough rule - meaning that it will perform the BGP-ACTION stuff on the prefix, but will not make any filtering decisions. Essentially rule 1 wipes the prefixes clean of prepend-path (useless in an in-filter, by the way) and wipes the communities off of all prefixes, and finally appends nothing to the empty community list.
Untitled2.png
I just wanted to point out a common thing people don't know about Winbox GUI behavior. Notice the difference in the above two rules? That drop-down doesn't just hide/unhide the input field, it actually activates it. When the drop-down is expanded, then the blank input actually means: "set the community to nothing" - if you want to leave communities alone, then you need to close the drop-down expander (like in the right window).
Your input filter can be as short as one rule:
1) action=accept bgp-set-communities=xxxx:yyyy (whatever community value you want to use to indicate "learned from Orange", usually xxxx = your ASN, and yyyy can be whatever value makes sense for you to use)
This accepts everything from Orange (basically, trusting them not to send you a bunch of wrong routes) and flags them with your chosen community.
If you want to be a little less trusting, then you could also put some discard rules on your input filter from Orange - e.g. reject a default prefix perhaps, reject bogons, etc - but that's up to you to decide what you need to do filter-wise. If you want to apply the community to all prefixes but also do filtering, then you can do it in two ways - make the first rule apply the community, but have action=passthrough (keep processing) or else put all of your discard rules first, and make the last rule be an accept rule with the "set-communities" bgp-action as well.
For your output filters, just make the chain accept prefixes with the community you used in the IN-filter, and discard all others. (that would be in the BGP tab, not the BGP Actions tab)
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