Name is simply what you want to call your new token, such as "Fox Inu" or "Beta Swap".
Symbol will be the ticker of your token, such as FOX or BSW (normally tokens have a 3 letter uppercase symbol).
Total Supply will be number of tokens available. Token Total Supply VALUE will be total number of tokens to the power of decimal places. (eg. if total supply is 1,000,000 token then give 1000000 as a value).
Decimals is how many decimal places your token can have, which determines how divisible it is. Generally tokens will have minimum 6 decimals and maximum 18 decimals, which allows 1 token to be divided into millions or trillions of pieces (eg. with 18 decimals you could have as little as 0.000000000000000001 of a token).