ExpressionEngine’s built-in Rich Text Editor (RTE) is usually used inside the Control Panel. This module allows you to also use the RTE outside of the Control Panel, in your site’s front-end templates. You can enable it in ->Developer->Add-Ons scroll midway click install. If you click on the top right icon, view code it will allow you to write html. Hope this can help you.
https://docs.expressionengine.com/latest/add-ons/rte.html
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