Table editor issues

I am having trouble adding rows to tables. I am fairly new to wordpress and editing existing pages that I did not create.

In the first instance, when I tried to click on ‘table’ in the visual editor, no drop down menu appeared. I tried this across several of these pages based on the same templated. Eventually, somehow, but I am not sure how, I managed to get that drop own to appear and I added a row. But this caused the who table to become much narrower and now I cannot widen it.

What I have tried:
1. Clearing browser caches
2. Disabling and re-enabling visual editor
3. Highlighting table in the editor before clicking ‘table’ in an attempt to get a drop-down menu
4. Placing the cursor in a table cell and clicking ‘table’ in an attempt to get a drop-down menu

When I hover on the table, a cursor appears as if I could widen columns with it, but when I try it does not work.

What I need:
1. To be able to add rows to tables (unsure why ‘table’ doesn’t offer drop-down options when I click it – is there a trick to this?)
2. When I add a row, it doesn’t change the width of each column in the table, or if it does I can easily edit it back to the desired widths.

Any help appreciated.

The page I need help with: [log in to see the link]