If you're having trouble trading certain products on MetaTrader, here are a few things to check:

Check your login status

• If you see an "invalid account" message, this indicates that you have entered incorrect login credentials.
• If the "new order" option is grayed out or unavailable, you may be logged in with a read-only password, or your login was unsuccessful.

Check for tradable products
Certain products are only available in specific account types. Ensure that your account type supports the product you're trying to trade.

Check trading hours
Right-click on the product and select "specification" to view its trading hours.

Margin requirements
If you do not have sufficient margin in your account, you may not be able to execute a trade for specific products. Ensure that you have enough margin to support any trades you wish to make.