user78488: 
Hello I have 2 questions:
A) do I have to remove any of the plastic casings that I have highlighted in order to make the motors move.
B) What is the purpose of the black plastic casing that I have pointed out?

user4143: 
A) do I have to remove any of the plastic casings that I have highlighted in order to make the motors move.

Those aren't "casings", those are diodes. They are part of the circuit and must be left alone.

B) What is the purpose of the black plastic casing that I have pointed out?

That is a "jumper" and is used to connect the +5V pin to the internal 5V regulator so the board can be run from just the 12V input power supply. Remove that if, and only if, you want to supply 5V to the board separately from elsewhere.

78488: <p><a href="https://i.stack.imgur.com/Wygg4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Wygg4.png" alt="enter image description here" /></a>
Hello I have 2 questions:
A) do I have to remove any of the plastic casings that I have highlighted in order to make the motors move.
B) What is the purpose of the black plastic casing that I have pointed out?</p>
 4143: <blockquote>
<p>A) do I have to remove any of the plastic casings that I have highlighted in order to make the motors move.</p>
</blockquote>
<p>Those aren't &quot;casings&quot;, those are diodes. They are part of the circuit and must be left alone.</p>
<blockquote>
<p>B) What is the purpose of the black plastic casing that I have pointed out?</p>
</blockquote>
<p>That is a &quot;jumper&quot; and is used to connect the +5V pin to the internal 5V regulator so the board can be run from just the 12V input power supply. Remove that if, and only if, you want to supply 5V to the board separately from elsewhere.</p>
