What is your pool size?
Actually, now's a good time to add a signature with all your info.
Go to User Control Panel, then Profile, then Edit Signature. Enter the type of pool, the size, the surface, your pump info, filter info anything else you may have in the setup. You are allowed 5 lines of text.
You must have calculated wrong, entered the wrong numbers somehow - or your PH wasn't 6.8.
You'll need some muratic acid now, to lower it back down to 7.5.
Please update your information so I can confirm how much you should add.
Anytime you are unsure of the numbers/amounts post here and we can help you before you add too much of something.
I understand your frustration, all this new info can be a bit overwhelming.
On the kit- this site doesn't sell kits. We recommend two kits, did you get the TF-100 from TFtestkits.net?