Firstly, your server needs to be running Windows. Install mIRC (download from mirc.com). Then, download Aeron's MTAmA tool (from here), extract all the files into your mIRC folder. Then in mIRC, hit ALT+R twice and go File->Load and select mta.mrc. Click Yes if prompted, and it should load MTAmA. Put your server info into this window, and hit connect. You should be able to type messages to your server through admin. Then in MTAmA, click on General->Scripts and Load. Load your script. Walaa.