Google Blogger has tossed-out a table editor from its editing field. In other editors they were the dreadful HTML-polluters! Rendering enigmatic code that completely screwed up your lay-out, or even worse an entire template.
If you do want to use a table in Blogger, try conversing a table - with or without content - into a set of TABS. Then copy paste your entire 'tabbed' TABLE in the Blogger-Editor. The lay-out will be similar, and front-end it will render like a 'normal' TABLE and its content.