Very briefly, you should be aware that one additional meaning of 得 (de2) is to obtain.

Examples of this usage include 得到 and 获得.

In this particular instance, I think of 记得 as being 记 + 得, where the 记 means memory, 得 means to obtain, and put together we have: to obtain a memory. Thus, 记得 means to remember.

But you are right: the link you included omits this 得, which is a shame.

Very briefly, you should be aware that one additional meaning of 得 (de2) is to obtain.

Examples of this usage include 得到 and 获得.

In this particular instance, I think of 记得 as being 记 + 得, where the 记 means memory, 得 means to obtain, and put together we have: to obtain a memory. Thus, 记得 means to remember.