“Read-only” notification is informing you that you are logged to the MT4/5 with your account’s Investor (read-only) password.
Investor password allows you to monitor a certain trading account without having the ability to take action.
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To gain access and be authorized to place/close/modify trades on such account, please repeat the MT4/5 logging procedure while using the Master password instead of the Investor password.
If you do not know your Master password, please log in to your Client Office portal on the broker’s website where you may set it up.