If they experience technical difficulties, or problems in understanding something about the course, they MUST speak up; (Para.7)
Meaning: If they have equipment problems or have problems in understanding the course content or instructions, they must tell others.
Please pay attention to the word "experience" as this word is used as a noun with different meanings as well as a verb.
experience: something that happens to one and has an effect on the mind and feelings
(Note: "Experience" used in this sense is a countable noun; we can say: "experiences" or "an experience".)
Learning a foreign language was one of the most difficult yet most rewarding experiences of my life. (Text A) 学习外语是我一生中最艰苦也是最有意义的经历。
But when "experience" is used in the sense of "knowledge or skill, which comes from practice in an activity" (经验，感受，体验), it is an uncountable noun.
Don't correct him all the time; he'll learn by experience. 别总是纠正他，他会从经验中学习的。
And "experience" can be used as a verb, too, meaning, "feel, suffer, or learn by an experience" .
Margaret Rudland, head teacher in Hammersmith, also thinks children must experience actual peer relations. (Text C) 海默斯密斯学校校长玛格利特.鲁兰也认为孩子们必须与同龄人交往。