If you make a (free) Imgur-account, you can easily upload all your pictures there.
Uploaded pictures can then very easily be embedded in your post.
Embedding one or a few pictures full sized
- While logged into Imgur, hover over your username in the top right corner and click on 'images';
- Click on the image you want to embed. You'll get a bunch of links that you can use to post the image;
- Choose one of the two bottom options (BBCode or Linked BBCode) and click copy;
- Paste the BBCode in your post.
If you want to make the image responsive (i.e., make it fit the frame, no matter how large the screen is that people view it on), you have to make a little adjustment to the code. Example:
Original:
[img]http://i.imgur.com/UwPXpdE.jpg[/img]
Adjusted:

Make sure you adjust both the opening and the closing tag.
Embedding a whole gallery (also works for posting just one picture as a thumbnail link)
- To embed (the thumbnail links of) a whole bunch of images at once, you can click on 'View image info' on your Imgur gallery page;
- In the drop down menu, click on 'Generate image links';
- Select the images you want to post, and then click 'Done'. A window will pop up;
- From the first drop down menu in the pop-up window select 'Linked BBCode';
- From the second drop down menu select either 'Small Square' or 'Big Square';
- Copy the generated BBCode and paste it in your post.
The thumbnails will appear below each other. To line 'em up horizontally, backspace the BBCode for each image to the previous line.
Questions?