If you want it to be dynamic, use a dataview with a microflow as datasource, which return the object containing the name of the user. For example 'Account’. Then you will be able to use the attribute FullName as a placeholder in the text.
You should be able to simply edit the text in the toolbox. Here’s a reference: https://gettingstarted.mendixcloud.com/link/module/215/lecture/1675