if i add something to the config json file all the commands and groups will disapear i cant use it then in perms manager its still showing up but i cant use so what need i to type in json file to add a group cause now im typing this 
{
"Maximal Titles": 3,
"Maximal Characters Per Message": 128
},
[
{
"GroupName": "default",
"Priority": 0,
"Title": {
"Text": "[]",
"Color": "#",
"Size": 15,
"Hidden": true,
"HiddenIfNotPrimary": true
},
"Username": {
"Color": "#55aaff",
"Size": 15
},
"Message": {
"Color": "white",
"Size": 15
},
"Format": {
"Chat": "{Title} {Username}: {Message}",
"Console": "{Title} {Username}: {Message}"
}
}
],
[
{
"GroupName": "VIP",
"Priority": 0,
"Title": {
"Text": "[V.I.P.]",
"Color": "#FF8000",
"Size": 15,
"Hidden": false,
"HiddenIfNotPrimary": false
},
"Username": {
"Color": "#55aaff",
"Size": 15
},
"Message": {
"Color": "white",
"Size": 15
},
"Format": {
"Chat": "{Title} {Username}: {Message}",
"Console": "{Title} {Username}: {Message}"
}
}
], 

this is what i have so help whats going wrong

That means the configuration was edited wrongly to where it was no longer valid JSON formatting. I'd suggest making sure the default format is followed, utilize a JSON editor, else use a site such as https://jsonlint.com/

the json is valid so whats going wrong

The JSON portion you posted is not valid, is there more to what you have locally?

well just all the commands are not working
so i type /chat it says thats not a valid command so?

Merged post

i know how to add groups in folder but commands are just not working

Merged post

and how to add clantags?

For clan tags to show in Better Chat you need to have a compatible clans plugin installed, and with that you'll likely need to use the Better Chat Clan Tags plugin depending on which Clans you're using.
Try it without Better Chat Clan Tags first, if the tags don't show up, install it.

hi but why my betterchat commands are not working??

Make sure you have the required permission "betterchat.admin" granted.

i have
its just saying that
/chat isnt a command

with clan tags how to delete the second tag
i just want 1 clantag

Merged post

it finally works

Glad to know you got it working.

but do you mayby know how to delete one of the 2 clantags?

If you have multiple clan tags, the clans plugin you are using likely supports Better Chat on its own. Simply uninstalling Better Chat Clan Tags should do the trick.
Also, please keep to the topic of the thread and create a new one for unrelated questions.