First import the video on filmorago timeline.
Click on text and then click on templates.
scroll little to see lower thirds options. click on any of the option to see it’s preview. Enter text in textbox. Once done click on tick sign to add this lower third on timeline.
Drag and drop the lower third where you want it.
Click on lower third on timeline and then click on edit.
From here you can chanage font, color, the size of text.
If you want to replace this lower third select it and then click on replace option from lower thirds option and select the other option.