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One of the perks is that you can join the paid-members-only community.
Literal
Paid members-exclusive [genitive-の] community [to-に] can-enter [genitive-の] perk [subject-が] exist.
Web-service marketing register. コミュ is a casual clipping of コミュニティ ('community'), common in online discussion or forum contexts. 専用 ('exclusive use,' 'reserved for X') is a common suffix for restricted access: 会員専用 (members-only), 女性専用 (women-only), 関係者専用 (staff-only). 入会 (にゅうかい) is 'joining (a club, society, or organization)' — 入 (enter) + 会 (society, club). 特典 ('perks, benefits, privileges') is a business-marketing word specifically for bonus offers tied to membership or purchase. The whole sentence is a classic 'join today for these extras' pitch.