creation of primary key

hello
I just started using MySQLcontrol center (or MYSQLCC) and
I want to create a table using the gui
with
Primary Key articlenr
and 3 other atributes
how can I make my articlenr the primary key(PK)?
If i create the articlenr row and set PK to it by putting it in the Fields Used for Primary key I can not choose what kind of PK it has to be (I think I need the Unique)
---edit---
I did found an answer between difference of index and unique
now I still need to know what is a full text PK
--- end edit----
2nd question
what is the difference between
index type
index
unique
full text

thank you
anatak
ps: this is no homework (way too old to do homework)

index = a column in a table that the RDBMS "index"'s (catalogue's) to make searching faster... like when you do a "WHERE pkid = 5"... the pkid field would be indexed...

unique = self explanatory

full text = someone correct me if i'm way off, but this is were the RDBMS index's a text field, allowing you to query text fields quickly... like how google works.