Note that there is no automatic numbering of the table. You will also have to provide a caption on your own. Your table captions must be on the top of a table and at the bottom of a figure. A detailed discussion of markdown and how to write in Markdown is beyond the scope of this guide, but you should look up the following documentation to learn more about it: Mastering Markdown \cite{ruujjs}.
Now that we have covered how to insert lists and tables, we have covered three of the basic elements of writing an academic paper or proposal in Authorea:  paragraphs, lists, and tables. That still leaves the fourth and fifth element of academic writing, that of adding figures and citations. We will turn to adding figures in Authorea. 

How to insert figures and graphs in Authorea

Authorea does not provide you an environment where you can generate your own graphs and figures. You will need to identify or save figures on your hard drive. I suggest you save the figures in PNG (portable network graphics) format, and save it on your hard drive (avoid using a tablet or cellphone, save it on a laptop or desktop computer). Then, once you are ready to upload it, do:
Step 1. Click on the image icon on the top
Step 2: it will open a folder
Step 3: Select the image. It will show something like this at the point where you'd like to insert the image (for example, I selected a file named 'age.png' for this example):