First you login to your KDP Dashboard account and click on "Marketing" link at the top of the page.
Under Amazon Ads section, from the drop down menu pick Amazon.com (if you want to go to the Amazon USA ads, otherwise pick the country you want). Then click "Go To Ads Console."
At this point, I usually save this as a bookmark (favourite) so I can just directly go to the ads instead of through the KDP Dashboard.
By default this will show you all your campaigns listed on the main part of the page.
You can change the date range, to see whatever period for your ads, Today, Yesterday, Last Week, specific date range, etc.
You should click on "Columns" and click "Customize Columns" the first time in your ads and check every box from start date down, except "Cost Type" as this will always say the same thing, I also do not check "Top of Search Bid Adjustment" because I would never adjust my bids this way, nor "Detail Page View" as this will always be zero for the campaign type we use for books I believe. Then check everything down to ACOS. You could click further on, but most of those have to do with ebooks. Of course if you would like to check more than above, go ahead and do so. This is a matter of personal preference of course.
When you return in the future, it will remember your choices so you don't have to do it every time you login to Amazon Ads.