Click the Activity link under the My Account tab at top bar, it will take you to your personal activity streams. You can see the post status update box to the right of your profile picture, just click on it and start typing, then click the Post Update button to publish your status update.
You can also include photos by clicking the camera icon located below the post status update box. Type in your status update, then choose the image you want to upload – this may take several seconds for large file sizes. Click the Add Photos and Post Update button to publish both your status update and included photo, or click the Cancel button to discard your uploaded photo.
NOTE: photos uploaded through this method will be posted directly to your activity stream. If you want to upload a photo to your Chochalan album, then use the Album link.