Go to a specialist forum (e.g., Linux Satellite Support). Post your offer: "Offering: CAID 1830 (Canal Digital) - Looking for: CAID 098D (Sky DE)." Exchange your hostname, port, username, and password via private message (never post publicly).
I strongly advise against engaging in CCcam exchange. It violates laws in nearly all developed nations, can result in fines or legal action, and harms the broadcasting industry. If you are interested in Linux-based receivers for legal free-to-air satellite TV, that is perfectly fine—just avoid the card-sharing scene. cccam exchange
If you intend to participate in a legitimate peer exchange (where you legally own the card you share), follow these steps: Go to a specialist forum (e