After 20 years of use you should be able to tell that “partitioning menu”
means the menu which is about partitioning, and that a couple of buttons
below a list labeled “+” and “-” mean adding and removing from that
list, respectively. If you don't apply common sense and ignore people's
advice then it is no puzzle why you have been struggling.
Trisquel requires minimal technical knowledge to install and use, but like
anything worthy, it does require common sense and interest from you. Jargon
(do not confuse with slang) is present in all disciplines, not just
informatics; any practicer is expected to get used to it. You can look up a
term you don't know in a search engine; there is even one in the installation
DVD you used.
Modern software abstracts (hide from the user) a huge amount of complexity;
if you want to see a tiny bit of it, take a glance at this manual about your
and other CPUs or this specification about the web. However, often the more
the abstraction, the less control the user has. Some things can't be
abstracted because software needs the users's input to “know” what to do
according to his needs. The installer offers the option to abstract
partitioning or let you control it. Despite our advice (since the second
reply) to let it do the partitioning for you, you insisted in doing it
yourself, so you can't blame Trisquel for not hiding partitioning.
I really hope you reconsider your attitude of blaming others and the software
for your mistake and ignoring suggestions; then using a computer will feel
less like struggling. Asking for help is good, but be willing to listen to
the answers, and please do a web search before asking so that you won't ask
things answered thousands of times already. Put in practice these suggestions
or equivalent about your attitude and way of handling informatics.
Also, check the link to “documentation” that is in the top bar in almost
all Trisquel pages. The Debian and Ubuntu documentation and Wiki usually
apply to Trisquel too, but they may recommend proprietary software which we
don't, because it's unethical and some technical aspects are different.