Please stop changing the contribution of other users You are not an administrator you don t have the authority to block anyone from editing and you don t have any authority to issue warnings What you are doing amounts to trolling Please stop it Its fine if you put your many and varied opinions in the talk page but don t vandalize what other users have to say Wikipedia guidelines suggest that vandalism is reverted If you delete or modify the contribution of others on the talk page the page will have to be reverted from that point So please just don t do it