I accidentally unsubscribed (well, purposely, but I thought I was doing something else) from the integrated messaging web app, and it's saying there's an error everytime I try to log in. I've been using the web site to text for the past few days since my phone's battery is going bad and barely holds a charge. Is there any way to resubscribe to the web app, so I can use my laptop to text again, or is there any other apps I can add to Google Chrome or Firefox, to text from? I don't have a tablet or anything else to use, just my phone and laptop, and I'd rather use my laptop to preserve my battery.