You can do it in numerous of ways:
1. You can start with quoting the whole post and then delete the parts, which you want to exclude. But caution - see note about brackets below.
Example (I have put an extra space character after the "q" in "quote" to prevent the server from interpreting the example as an actual quotation)
[q uote=Jay_S post_id=50409 time=1499181230 user_id=1932]
Any help would be appreciated!
[/quote]
Looks like:
Jay_S wrote: ↑<span title="Tue Jul 04, 2017 4:13 pm">7 years ago</span>
Any help would be appreciated!
2. If you want to include more quotations from the same post, it might be inconvenient to repeat the steps above. So you may just copy the first opening bracket (see the note about brackets) and the last closing one, and then copy any text from the original post in between them.
Example
[q uote=Jay_S post_id=50409 time=1499181230 user_id=1932]
Put anything here
[/quote]
Looks like:
Jay_S wrote: ↑<span title="Tue Jul 04, 2017 4:13 pm">7 years ago</span>
Put anything here
3. You can simply use the opening and closing brackets without any reference to any post
Example:
[q uote]
Put anything here
[/quote]
Looks like:
Put anything here
Then, you can use the "Preview" button prior to submitting the post. You post will be displayed ABOVE the editor window in a form, in which it will appear on the forum. You can check, if everything is OK before actually submitting the post.
NOTE about brackets.
The editor uses brackets to differently treat some paragraphs of text. The brackets are always in the form:
[bracket] = opening bracket
[/bracket] = closing bracket
The word "bracket" should be replaced with the relevant command. For quotation, the command is "quote".
Note, that the closing bracket has always the character "/" in front of the command. The brackets can be nested within one another.
When editing quotations and deleting parts of it, you should pay attention, that every opening bracket has its corresponding closing bracket in the right place. Otherwise, you may get results, which are far from expectations.
By the way, in your first partial quotation you made a small mistake: you used [/quote] as an opening bracket. You can still edit the post and remove the "/" character. Then it should look better.
Hopefully I helped.
It's a real "Quotalogy", isn't it? And andmar is in his last semester. I saw that now: It doesn't carry over the original formatting in case there is any. So if the original had e. g. a bold word, it will be thin in the quotation - if you do it like a 1st semester person like me. 
). So, if you want to preserve the formatting - you must quote the whole post (you can still delete parts of it afterwards), when you don't care about the formatting - you can use the easy way.