problems with posting

dear fellows,

i noticed that many of you had bold sentences in their texts, and i have been desperately trying to know how to do so for my assignment. in all cases, it is late already for the first but i am wondering how to have the text bold in here. I tried to copy paste from word but it didn't work. i tried ctrl B and it also didn't work. if you please can help i will appreciate it. i am using safari and i don't know if this has to do with the browser!

Thanks in advance,

Bayan