How to add texture mapping for this rectangle by uploading bmp?

OpenGL OpenGL: Basic Coding
1

Hi, I have a rectangle:

glLoadIdentity();
	glBegin(GL_POLYGON);
	glColor3f(1.0, 1.0, 1.0);
	glVertex2f(-0.2f, -0.3f);
	glVertex2f(-0.2f, 0.2f);
	glVertex2f(0.2f, 0.2f);
	glVertex2f(0.2f, -0.3f);
	glPopMatrix();
	glEnd();

I wish to add texture on this rectangle, so anyone can give me some ideas?
Thanks