How can i change my current status?
I am online, but on my profile writes that i am "offline".
You might turned off the status shows to others. If you turned off it you or others will not find that whether you are online or offline. Simply shows as offline when click your profile.
Please go the Profile- account related settings.
Next to that you have check the box- 'Show others your online status?' to make visible your status to all.