Cannot include the = sign outside the bracket

[Sid_Chat]

Whenever I click on the = sign it gets included inside the bracket. If you can’t understand, then see below:
Instead of

obj[letter]=i

it is always taking

obj[letter=i]

Here’s a screenshot:

[Fun_Maria_Makers]

👹👺🧙🏻🫐🍖⛆

Wait is