You are about to login gmail.
In your inbox or select the emails you want to delete, click the delete icon, as shown in the picture.
Then click on the left menu, click More for more options, and finally click on trash to go to the Deleted Items section.
Sometimes you may eliminate or something by mistake then we want it back, that's what the recycle bin, one útlima option before losing everything completely. The good thing is that gmail is not erase anything, now has 15 GB of storage for free accounts, in case you're thinking this is too much for the use you need can acquire more space.
For example you can buy 100 Gb per month extra space with a monthly payment of 1.99 usd or purchase a pack of 1 Tb per month for only 9.99 usd.