In PHPMyAdmin how I view SQL syntax of a MySQL View? Also how to alter it?

use the appropriate page for the tabnle you wish to modify
OR use the DDL variant / dialect of SQL
ALTER TABLE.........

or use a graphical tools such as MySQL Administrator, mind you that doe sassume that you have full access to the DB. if the DB is on a ISP's sever you may well be restricted to use PHPMyAdmin.