Error 413 while uploading photos

Hello everyone

I have some serious trouble with uploading photos to my blog site. First I spotted it during creating new entry. While trying to upload a photo, I received “HTTP error” message. It was just that, nothing specific. Then I tried to upload photo to my library via “Media” section in my WordPress tool’s cockpit. When I tried that, I received this:

“Got the error: Request Entity Too Large
while trying to obtain https://zamorzembogwieco.pl/wp-admin/media-new.php
3058105 bytes is too much data to post” – nothing more, nothing less.

Now the limit for uploading is 64 MB, and after some experimenting, I discovered that I cannot upload anything above 2 MB. I know nothing about html, programming and all that stuff, so I would appreciate some “idiot-proof” kind of support.