The dtterm cursor blinks by default. You can turn off the blinking or change the blink rate (see "To Set the Cursor Blink Rate").
If the Global Options dialog box is not displayed, choose Global from the Options menu.
Click the Blinking Cursor button in the Cursor Control section and choose to either have the cursor blink (Enabled) or not blink (Disabled).
Click OK at the bottom of the Global Options dialog box or press Return to save your selection and exit the window.
To save your selection and retain the window, click Apply.