A few explanations:
You will need to set up a database config in addons/sourcemod/configs/databases.cfg. There is a file (db info to add.txt) with example setups for either mysql or sqlite. The plugin supports both.

ChatTags_blocked.cfg: Each line in this file is a separate sub-phrase that is blocked for all players who do not have the configured admin flag. e.g. if "owner" is a line, then "owner", "growner", or even "addwdaownercqdq" are blocked for anyone w/o the admin flag. (non-case sensitive).

ChatTags_colors_csgo.cfg, ChatTags_colors_ins.cfg and ChatTags_colors.cfg: ChatTags_colors_csgo is for csgo, ChatTags_colors_ins.cfg is for insurgency, and the other is for all other games. No need to install the ones that dont apply. For ChatTags_colors.cfg, you can add as many hex colors as you want (http://www.colorpicker.com/ is a good site to make them). The cs:go one has no other colors available (well, there is ONE more, but it causes formatting issues, so it is hidden). The insurgency just has 7 colors at this time.

Similar to the config files, there are translation files for several games. While it doesnt hurt to add them all, the only one that will be used is the one matching your game (e.g. scp.cstrike.phrases.txt for CS:S, or scp.csgo.phrases.txt for CS:GO).

ChatTags_groups.cfg is the main "setup" config other than the cvar file that is generated. Be sure to read the info at the top for a full explanation of all the ways it can be used/configured.

The web stuff is in its own folder and has further instructions inside.

If you have more questions or any issues, let me know!