This forum software isn't set up for multi-quoting. Apparently the developers feel that it makes forums look messy and cluttered and they aren't very interested in introducing it. However double/triple/etc posting also looks messy and cluttered, and many of us prefer multi-quoting when we want to address more than one person at a time.
So there is a way to do it, like so:
Step 1
I want to multi-quote posts #2 and #4 of this thread. The first thing I do is click Reply next to post #2.
The page will scroll down automatically to the reply box. Scroll back up, and hit reply for post #4.
Step 2
The two posts are now both in your reply box. You can type your responses and Post Reply.
However, if there are posts you want to quote on another page, you can carry on with the rest of the steps.
So there is a way to do it, like so:
Step 1
I want to multi-quote posts #2 and #4 of this thread. The first thing I do is click Reply next to post #2.
The page will scroll down automatically to the reply box. Scroll back up, and hit reply for post #4.
Step 2
The two posts are now both in your reply box. You can type your responses and Post Reply.
However, if there are posts you want to quote on another page, you can carry on with the rest of the steps.