i believe it is because of how new your account is. a moderator needs to approve your posts before you can pm others, and start posting normally around the forums. this is to prevent spam bots, and accounts which could prove to be harmful to the site.
When users first register, they are added to a 'Newly Registered Users' group which has limited posting and messaging abilities. This is to prevent spammers from posting adverts or inappropriate material in the forum.
To become a full member, you need to make a post in the forum and wait for it to be approved by a moderator or admin. Once it has been approved you will become a regular member and will be able to PM and send trade messages. Future posts won't require post approval.
Since you were able to post this, you should be able to message people now(:
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx hi! you can call me swishy, i use she/her pronouns. i work full time at a senior living facility and live a quiet, content life with my fiancée and two cats. i check cs every day, so don't feel shy about giving me a poke <3 !!